[TheForge] blown forge

[Ben Barrett]

>From my little experience, blown is easier to rig up, due to lower
pressures & great variety of what-will-work :)  Venturi's require more
tuning, but a well-made unit can be easy—you may want to polish the inside
of the venturi since any interruption to flow there makes a difference.
 Common blown fan is a hair dryer, usually with the heater coil removed
(leaving part of the heater coil will give the air a nice preheat & dry
though!).

>From what I've read, it can be difficult to get a complete burn with air
and propane, I'm glad I was able to get one of Art Anderson's burners at a
NWBA conference.

Have you considered adding a little bit of oxygen when you want forging
temps?

On a related note, I am curious if anyone's used an oxygen concentrator
with propane or even natural gas?
I have access to some used models, which the local glassblowers are not
happy with since they use a huge amount of oxygen.
I was thinking that even a trickle of oxy, along with a well-tuned venturi
design, might be very efficient.

Ben



On Wed, Sep 4, 2013 at 4:14 PM, Dan Scheid <damales at pollybutte.net> wrote:

>
> I have a side draw burner venturi propane forge (used a tee for air intake)
> with time and tricks my forge gets to welding temps It is right at the 2350
> but I'm greedy . I want more heat 2600-3K  would be a dream so I'm thinking
> of adapting these burners to blown . Ether remove the mig tip or enlarge.
> Move it down past the intake add a fan to the side and turn down the
> pressure.  So here are my question.
>  1) do you think it will get me the extra heat?
> 2) can this venture design be adapted
> 3) what psi does blown work at 1-2? Or more
> 4) what size fan in cfm  should I be looking for my thought are a dc motor
> so I can put a rheostat on it although some AC motor can also.
> Thank for the input
> Dan Scheid
> Ps this is my 5th or 6th forge with venture burners  all from 3/4 tubes to
> 1" tubes this on is the 1" with I think a 2 1/2 tee but I can't remember.
>
>
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